On Wed, Jul 30, 2008 at 11:01:32AM +0200, Jürgen Mell wrote:
> Hello Thomas,
>
> On Wednesday, 30. July 2008, Thomas Gleixner wrote:
> > We are pleased to announce the 2.6.26-rt1 tree, which can be
> > downloaded from the location:
>
> I have tried the new kernel and have some good news and some bad news:
>
> The good news: The machine boots and seems to run without major problems.
>
> The bad news: It produces continuously lots of bug messages in the error
> logs (cf. attached dmesg.tgz). The error at rtmutex.c:743 was already
> present in 2.6.25-rt* when ACPI was enabled. The 'using smp_processor_id
> () in preemptible code' is new here with 2.6.26.
>
> Machine is an old Athlon XP (single core) on an EPOX mainboard with VIA
> chipset.
>
> If I can help with testing, please let me know.
The following patch should clear things up. It is against 2.6.25.8-rt7,
but should still apply.
------------------------------------------------------------------------
Disable preemption around statistics for RCU boost and unboost calls.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
rcupreempt-boost.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff -urpNa -X dontdiff linux-2.6.25.8-rt7/kernel/rcupreempt-boost.c linux-2.6.25.8-rt7-preemptfix/kernel/rcupreempt-boost.c
--- linux-2.6.25.8-rt7/kernel/rcupreempt-boost.c 2008-06-24 14:14:52.000000000 -0700
+++ linux-2.6.25.8-rt7-preemptfix/kernel/rcupreempt-boost.c 2008-06-24 14:38:59.000000000 -0700
@@ -205,11 +205,23 @@ RCU_BOOST_TRACE_FUNC_DECL(boost_readers)
RCU_BOOST_TRACE_FUNC_DECL(try_unboost_readers)
RCU_BOOST_TRACE_FUNC_DECL(unboost_readers)
RCU_BOOST_TRACE_FUNC_DECL(over_taken)
+static void rcu_trace_boost_boost_called_preempt(void)
+{
+ preempt_disable();
+ rcu_trace_boost_boost_called(RCU_BOOST_ME);
+ preempt_enable();
+}
+static void rcu_trace_boost_unboost_called_preempt(void)
+{
+ preempt_disable();
+ rcu_trace_boost_unboost_called(RCU_BOOST_ME);
+ preempt_enable();
+}
#else /* CONFIG_RCU_TRACE */
/* These were created by the above macro "RCU_BOOST_TRACE_FUNC_DECL" */
-# define rcu_trace_boost_task_boost_called(rbd) do { } while (0)
+# define rcu_trace_boost_task_boost_called_preempt(rbd) do { } while (0)
# define rcu_trace_boost_task_boosted(rbd) do { } while (0)
-# define rcu_trace_boost_boost_called(rbd) do { } while (0)
+# define rcu_trace_boost_boost_called_preempt(rbd) do { } while (0)
# define rcu_trace_boost_try_boost(rbd) do { } while (0)
# define rcu_trace_boost_boosted(rbd) do { } while (0)
# define rcu_trace_boost_unboost_called(rbd) do { } while (0)
@@ -261,7 +273,7 @@ void __rcu_preempt_boost(void)
WARN_ON(!current->rcu_read_lock_nesting);
- rcu_trace_boost_boost_called(RCU_BOOST_ME);
+ rcu_trace_boost_boost_called_preempt();
/* check to see if we are already boosted */
if (unlikely(rcu_is_boosted(curr)))
@@ -313,7 +325,7 @@ void __rcu_preempt_unboost(void)
int prio;
unsigned long flags;
- rcu_trace_boost_unboost_called(RCU_BOOST_ME);
+ rcu_trace_boost_unboost_called_preempt();
/* if not boosted, then ignore */
if (likely(!rcu_is_boosted(curr)))
--
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